[bldg-sim] EnergyPlus - DOE

[Liu, Xiaobing]

Is there any comparison between e+ and DOE 2 with regard to the accuracy of the predicted loads and energy consumption? I'm curious about the benefits (in terms of accuracy) obtained from simultaneously solving the building loads and HVAC systems.
 
Xiaobing

________________________________

From: bldg-sim at gard.com on behalf of Vämshi Goojé
Sent: Thu 1/19/2006 8:30 AM
To: bldg-sim at gard.com
Cc: bhandari at fenestration.com
Subject: [bldg-sim] EnergyPlus - DOE



Mahabir,
The extended run time in EPlus could be due to transient analysis vs. steady state in doe 2.
Vamshi


On 1/18/06, Mahabir Bhandari <bhandari at fenestration.com> wrote: 

	Brian,

	 

	I think one additional difference from uses' point of view, which is not reported in this report, is simulation run time. It seems EnergyPlus takes 5-10 times longer to complete a whole year simulations than DOE2. I was running a simple 5 story building with VAV system and it took me more than 40 minutes for annual hourly simulations (1 hr time step) in EnergyPlus while eQuest could run the same building in less than 5 minutes. I am interested in hearing from others on the run time issue.

	 

	Mahabir Bhandari

	 

	 

	
________________________________


	From: Brian Fountain [mailto:bfountain at greensim.com] 
	Sent: Wednesday, January 18, 2006 12:12 PM
	To: bldg-sim at gard.com
	Subject: [bldg-sim] EnergyPlus - DOE

	 

	That is a big question.

	 

	For a comparison of current energy simulation software, you could look at Dru Crawley's paper comparing 20 tools:

	http://www.energytoolsdirectory.gov/pdfs/contrasting_the_capabilities_of_building_energy_performance_simulation_programs_v1.0.pdf

	 

	Main differences between DOE and EnergyPlus:  

	1)       DOE calculates the space loads for each hour then calculates the system and plant response for each hour.  EnergyPlus simultaneously solves the loads the system/plant response for each timestep.

	2)       DOE has a fixed 1 hour timestep, EnergyPlus has a variable timestep (down to 1 minute?).

	3)       There are also key issues with the weighting factor assumptions, the wall convective coefficients.

	 

	I haven't used EnergyPlus much yet.  What did I miss guys?

	 

	Brian Fountain

	 

	-----Original Message-----
	From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On Behalf Of Renato Sousa
	Sent: January 18, 2006 10:56 AM
	To: bldg-sim at gard.com
	Subject: [bldg-sim] EnergyPlus - DOE

	 

	Hello everybody.

	 

	I would like to know if anybody has experience on using both EnergyPlus and DOE.

	Currently I'm using an interface for EnergyPlus. From the software description I couldn't find out the main differences between EnergyPlus and DOE. Does anyone know the main differences or where can I find them?

	 

	From the description it is said that EnergyPlus was based on DOE and BLAST so I suppose EnergyPlus has some extra features but I'm not sure if that is right.

	 

	Best regards,

	Renato Sousa 

	Tel: +351 919 316 221 | E-mail:  renato.sousa at fluidinova.pt <mailto:renato.sousa at fluidinova.pt> 

	 

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	TECMAIA - Parque de Ci?ncia e Tecnologia da Maia

	Rua Eng? Frederico Ulrich, n? 2650 | 4470-605 Moreira da Maia | Portugal                  

	Tel: +351 229 408 265 | Fax: +351 229 408 266

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-- 
Vämshi Goojé



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